, Volume 129, Issue 6, pp 413-415
Date: 08 Nov 2012

Evolution and deployment of VoLTE (Voice-over-Long-Term-Evolution)

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Four approaches to mobile broadband voice

In the near future and after the evolution from TDM to IP and from traditional switches to softswitches, mobile voice services will evolve to mobile broadband (MBB) voice services. In terms of network evolution, it will mean the evolution of GSM/CDMA/UMTS to LTE on the radio network side and the evolution of CS to IMS on the core network side. Over the last few years, there have been multiple views, technologies, and evolution paths for LTE voice services. At last, four approaches have been accepted as possible commercial choices.

The first approach is based on circuit-switched fallback (CSFB). LTE just provides data services, and when a voice call is to be initiated or received, it will fall back to the CS domain. When using this solution, operators just need to upgrade the MSC instead of deploying the IMS, and therefore, can provide services quickly. However, the disadvantage is longer call setup delay. However, in most cases, the CSFB solution